Improvement in boring-machines



L UNITED STATES PATENT OFFICE.

. JOSEPH EDeEooMH, OE WORCESTER, MASSACHUSETTS, ASSIGNOE TO THOMAS H. DODGE, OE SAME PLACE.

Specification forming part of Letters Patent No. 113,364., dated June 28, 1864.

To all whom it may concern,.-

Be it known'that I, JOSEPH EDGECOMB, of the city and county of Worcester, and State of Massachusetts, have invented certain new and useful Improvements in Boring-Machines; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, in which* Figure l represents a front view of said machine. Figs. 2 andS represent longitudinal vertical sections through the same. Fig. 4 represents a horizontal section through the frame of the machine. Fig. 5 represents a de tached view, hereinafter to be referred to.

Y My invention relates to the application of certain devices to boring-machines, whereby the penetrating motion of the augeris stopped at a certain point to break the thread in the wood, and is raised or withdrawn from the hole automatically while the machine is in operation, thereby obtainin g a perfect bore and greatly facilitating the Operation.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A represents the frame of the-machine. It is ofsemi-cylindrical shape, widening near its lower end, where it is hinged at a to block or bed B. It can be turned down on said hinge to make it convenient for transportation and for boring angular holes. When raised up, as represented in the drawings, itis held in its vertical position by the clamp-screws b, which pass through the slotted standards C of the bed B.

D represents a carriage, which can slide vertically on the ways c of the frame A. It supports the horizontal crank-sh aft E by which the bevel-wheel F is turned, and also the vertical augershaft Gr, which is operated by the bevel-pinion H.

' I represents an ordinary gcar-wheel, which is secured to the crank-shaft E, and which gears with the rack K. The latter is pivoted at its lower end, d, to the frame A, while its upper end enters a recess, f, at the upper end ofthe frame, where the spiral spring g presses it toward the front of the frame, as seen in Fig. 3. The upper part of the rack K is curved, for purposes to be explained in the operation of the machine.

L represents a cylindrical sprin g-rod, which passes through the lugs u of the rack K, and whose forked upper end bears against either ofthe shoulders l or 2 of the projection h, as shown in dotted lines in Figs. 2 and 3 and in full lines in the detached section at Fig. 5. It is pressed upward against said projection by the action of the coiled sprin g c, which bears against the upper lug, u, and against the shoulder 3 of the rod L.

m represents a screw-thread on the crankshaft E, which terminates in a cam, n, and which operates a dog, o, secured to the springrod L.

M represents a stop, which can be adjusted on the edge of the frame A, and can be secured in any desired position by means of the set screw p, (shown in Fig. 4,) and its object is to arrest the motion of the sliding carriage at a certain point, where the penetrating motion of the auger has to stop, to cut the thread in the wood. The edges or ways c qt' the frame A are graduated, so that the stop M may readily be adjusted according to the depth of the hole to be bored. The dog o on the sprin grod L is also made adjustable thereon by means of the screw q, and the method of adjusting it will be fully understood from `the operation of the machine.

The operation of the machine is as follows: The machine is placed upon the stick to be bored, and the auger properly adjusted, together with the dog o and stop M, when the operator, by means of the cranks N, turns the wheel I ftoward him until said wheel has passed down below the upper curved part of the rack K and becomes entirely free. thereof, as indicated in red lines in Fig. 2. The gear I now being free from rack K, and the auger resting upon the piece to be bored, the operator reverses the motion of the cranks N, and the auger enters the wood, the same as in an ordinary `boring-machine, and continues until the lower edge, x, of the carriage D comes in Contact with the stop M, when its descending motion and the penetra-tionof the auger is arrested, and it commences to cut the thread in the wood. At this instant the dog o, having been properly adjusted, is acted upon by the screw m on shaft E, is turned toward the center of the machine, and is finally pressed down by cam n, as shown in Fig. 3. Thus the rod L is pressed down, and its upper end descending so as to clear the shoulder 2, Figs. 2, 3, and 5, the coiled spring g causesthe rack K to ly forward and to come in gear with the wheel l, the upper end of the rod L being stopped bythe shoulder 1 onv projection 7L, as shown in red lines in Fig. 5, and as the cranks N are further turned the carriage l) and the auger are raised by the action of the wheel I on rack K, as shown in Fig. 2, and while thus rising, thewheel I'presses against the upper curved part of the rack K and push es it back, together with the rod L,vwhich is connected with it, until the wheel I has passed the uppermost cog of the rack, when the latter and the rod L is sprung again behind the shoulder 2 ot' the projection h, and as the rod L is pressed upward by the action of the spring c 1 and dog o with the spring-rod L, for the purA pose ot' throwing the rack-har 4in and out ot lgear from the wheel l, substantially in theVV the rack K will again be secured in a position where it will be out of gear with the wheel I, when the latter is brought down over the uppermost cog of the rack K, and the operation of boring can be renewed, as above described. The upper end of the spring 'c is secured to l;

`ing said rod upward and of imparting to it a itendency to turn so as to force the dog o to the rod L, while the lower end presses upon the rack K. The rod L thus has a tendency to turn or twist by the action of said spring, and when the dog o has been pressed toward the center by the screw mit is sprung back by the action of the spring v as soon as it has cleared the cam a. Stop M is provided with a steel point, 6, which enters one of the notches on the side of the frame A, and, in combination with the screw p, forms a very neat andy true devicefor arresting the descent of the auger. l

The object of the curved part K of the rack K is to hold the carriage D and auger up with out any attention or fastening on the part of 4the operator.

fully up, is presse-d' by the uppermost cog on the rack-bar below its center, and in such a manner as to give the gear I a tendency to move up still higher. It will also be observed that thc upper end of the rack-bar K is alvlowed to spring forward considerable after the center of gear I has passed the upper cog on K, before `the upper end of rod L is arrestedbyits stop 2, which adds very much to the security of the device as a means of holdingup the auger, as abovedescribed.

Having thus fully described the nature of my invention, what I claim herein as new, and desire to secure by Letters Patent, is-

1. The combination of the stop M with the device for automatically throwing into action the rack-bar K and gear I after the auger has made one or more revolutions to break the thread in the wood, substantially as and for the purpose herein described.

2. The combination of the screw m, cam a,

manner herein described.

3. In combination with the. rod L, thespiral spring fn, for the twofold purpose of forcits original position after it has been acted upon by screw m, substantially asy herein described.

4. In combination with the stop M, the setscrew p, and point 6, when applied to. boringmachi-nes, substantially as herein described.

5. The combination ofthe augershaft G bevel-wheels F H, wheel I, screw m, cam n, rack-bar K, spring L withv the several devices for operating them, substantially asv and for the purposes set forth.

JOSEPH EDGECOMB.

Witnesses:

J. HENRY HILL, ELIZA D. DODGE. 

